Tunable stereoselectivity in the addition of 2-lithiothiazole to L-serinal derived N-benzyl nitroe. Synthesis of C-2 epimer 2,3-diamino-4-hydroxybutanals
作者:Alessandro Dondoni、Francisco L. Merchan、Pedro Merino、Tom�s Tejero、Valerio Bertolasi
DOI:10.1039/c39940001731
日期:——
A Complete reversal of distereoselectivity (ds 95%) in the addiition of 2-lithiothiazole to L-serinal derived N-benzylnitrone has been achieved by the change of the hydroxy and amino protective gruops in the aldehyde moiety; the resultant epimeric 2-thiazolyl N-benzyl hydroxylamines were converted to C-2 epimer 2,3-diaminio-4-hydroxybutanals via reductive dehydroxylation and thiazolyl-to-formaly conversion.
the effects of ring structure and a substituent on the glutathione peroxidase- (GPx-) like antioxidant activities of aliphatic selenides, series of water-solublecyclicselenides with variable ring size and polar functional groups were synthesized, and their antioxidant activities were evaluated by NADPH-coupled assay using H2O2 and glutathione (GSH) in water and also by NMR spectroscopy using H2O2
为了阐明环结构和取代基对谷胱甘肽过氧化物酶-(GPx-)的影响,如脂肪族硒化物的抗氧化活性,合成了一系列具有可变环尺寸和极性官能团的水溶性环状硒化物,并评估了其抗氧化活性通过使用H 2 O 2和水中的谷胱甘肽(GSH)进行NADPH偶联测定,以及使用H 2 O 2和二硫苏糖醇(DTT红)进行NMR光谱分析)在甲醇中。在水中类似于GPx的活性,硒化物氧化的二级速率常数以及在水中计算出的HOMO能级之间发现了很强的相关性。结果支持了氧化过程是催化循环的速率决定步骤的结论。另一方面,对于在甲醇中观察到的活性没有获得这样的相关性。确定最佳环尺寸为五。取代基的类型(NH 2
DISULFIDE-BASED PRODRUG COMPOUNDS
申请人:Ludwig-Maximilians-Universität München
公开号:EP4062942A1
公开(公告)日:2022-09-28
The present application relates to a compound having the formula (I)
A-L-B (I)
wherein
A is represented by
L is a bond or a self-immolative spacer;
B is represented by
The compound is capable of releasing molecular cargo in the presence of a reductase and is thus suitable for treating, ameliorating, preventing or diagnosing a disorder selected from a neoplastic disorder; atherosclerosis; an autoimmune disorder; an inflammatory disease; a chronic inflammatory autoimmune disease; ischaemia; and reperfusion injury.
Cyclic Disulfide C(8) Iminoporfiromycin: Nucleophilic Activation of a Porfiromycin
作者:Sang Hyup Lee、Harold Kohn
DOI:10.1021/ja030577r
日期:2004.4.1
The clinical success of mitomycin C (1) and its associated toxicities and resistance have led to efforts to prepare semisynthetic analogues (i.e., KW-2149 (3), BMS-181174 (4)) that have improved pharmacological profiles. In this study, we report the preparation and evaluation of the novel 7-N-(1'-amino-4',5'-dithian-2'-yl)porfiromycin C(8) cyclized imine (6) and its reference compound, 7-N-(1'-aminocyclohex-2'-yl)porfiromycin C(8) cyclized imine (13). Porfiromycin 6 contains a disulfide unit that, upon cleavage, may provide thiol(s) that affect drug reactivity. We demonstrated that phosphines dramatically accelerated 6 activation and solvolysis in methanolic solutions ("pH 7.4") compared with 13. Porfiromycins 6 and 13 efficiently cross-linked EcoRI-linearized pBR322 DNA upon addition of Et3P. We found enhanced levels of interstrand cross-link (ISC) adducts for 6 and 13 compared with porfiromycin (7) and that 6 was more efficient than 13. The large Et3P-mediated rate enhancements for the solvolysis of 6 compared with 13 and a N(7)-substituted analogue of 1, and the increased levels of ISC adducts for 6 compared with 13 and 7 are attributed to a nucleophile-assisted disulfide cleavage process that permits porfiromycin activation and nucleophile (MeOH, DNA) adduction. The in vitro antiproliferative activities of 6 and 13 using the A549 tumor cell line (lung adenocarcinoma) were determined under aerobic and hypoxic conditions and then compared with 7. Both 6 and 13 were more cytotoxic than 7, with 13 being more potent than 6. The C(8) iminoporfiromycins 6 and 13 displayed anticancer profiles similar to 3.